Air supplement system of hot blast stove

Abstract

The utility model discloses a hot-blast stove air supplement system which is located between a hot-blast stove combustion fan and a main smoke pipeline, the hot-blast stove combustion fan is communicated with a fan outlet air pipe, and a temperature detection instrument and an oxygen content detection instrument are installed on one end side, close to the hot-blast stove combustion fan, of the fan outlet air pipe. An air supplementing pipeline is installed on the hot blast stove combustion fan, one end of the air supplementing pipeline is communicated with air, and an air supplementing adjusting valve is installed on the air supplementing pipeline. The hot blast stove combustion fan is communicated with the main flue gas pipeline through a flue gas branch pipe, and a flue gas adjusting valve is mounted on the flue gas branch pipe. The device has the advantages that the structure is simple, transformation is easy, new gas consumption points are not generated by utilizing existing high-temperature flue gas, system operation is simple, the ignition temperature and the combustion efficiency can be effectively improved, and gas consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the field of steel smelting, in particular to an air supply system for a hot blast furnace. Background Art

[0002] At present, the SCR external hot blast furnace on the production line meets the process requirements by mixing combustion of combustion air and blast furnace gas to release heat during operation. Since the combustion air of the external hot blast furnace is usually at room temperature, the gas combustion efficiency is low, resulting in SCR gas consumption accounting for about 1 / 3 of the gas consumption in the sintering process. Since the high gas consumption has a great impact on the energy consumption index of sintering production, the sintering gas consumption control technology is currently one of the main technologies for sintering energy saving and consumption reduction in the metallurgical industry. Utility Model Content

[0003] The utility model aims to provide an air supply system for a hot blast furnace.

[0004] The technical solution to achieve the purpose of the utility model is: a hot blast stove air supply system, which is located between the hot blast stove combustion-supporting fan and the main flue gas duct, the hot blast stove combustion-supporting fan is connected to the fan outlet air duct, and a temperature detection instrument and an oxygen content detection instrument are installed on the fan outlet air duct at one end close to the hot blast stove combustion-supporting fan, the hot blast stove combustion-supporting fan is installed with an air supply duct, one end of the air supply duct is connected to the air, and an air supply regulating valve is installed on the air supply duct; the hot blast stove combustion-supporting fan is connected to the main flue gas duct through a flue gas branch pipe, and a flue gas regulating valve is installed on the flue gas branch pipe.

[0005] Furthermore, there are two hot blast furnace combustion-supporting fans, and each of the two hot blast furnace combustion-supporting fans is respectively equipped with an air supply pipe, and each of the air supply pipes is equipped with an air supply regulating valve. Each of the hot blast furnace combustion-supporting fans is connected to the main flue gas pipe through a flue gas branch pipe, and each of the flue gas branch pipes is respectively equipped with a flue gas regulating valve.

[0006] The utility model introduces part of the high-temperature flue gas purified by the denitrification system equipment into the hot blast furnace through the main flue gas pipeline through the flue gas branch pipe. The hot air is used as combustion air and mixed with the coal gas and then ignited to achieve hot air ignition. Due to the high temperature of the hot air, the coal gas can be burned more quickly. It has the advantages of simple structure, easy transformation, using the existing high-temperature flue gas without generating new coal gas consumption points, and simple system operation. It can effectively improve the ignition temperature and combustion efficiency and reduce gas consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the structure of the hot blast furnace air supply system according to an embodiment of the utility model; wherein the arrow represents the wind direction. DETAILED DESCRIPTION

[0008] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0009] like Figure 1 As shown, a hot blast stove air supply system is located between a first hot blast stove combustion-supporting blower 10, a second hot blast stove combustion-supporting blower 20 and a main flue gas duct 30, the first hot blast stove combustion-supporting blower 10 and the second hot blast stove combustion-supporting blower 20 are respectively connected to the blower outlet air duct 40, and a temperature detection instrument 50 and an oxygen content detection instrument 60 are installed on one end of the blower outlet air duct 40 close to the first hot blast stove combustion-supporting blower 10 and the second hot blast stove combustion-supporting blower 20; the first hot blast stove combustion-supporting blower 10 and the second hot blast stove combustion-supporting blower 20 are connected to the main flue gas duct 30, and ... An air supply duct 1 is respectively installed on the fan 10 and the second hot blast furnace combustion-supporting fan 20, one end of which is connected to the air, and an air supply regulating valve 2 is installed on each of the air supply ducts 1. The first hot blast furnace combustion-supporting fan 10 is connected to the main flue gas duct 30 through the first flue gas branch 3, and the first flue gas branch is connected to the second hot blast furnace combustion-supporting fan 20 through the second flue gas branch 4. A flue gas regulating valve 5 is respectively installed on the first flue gas branch 3 and the second flue gas branch 4.

[0010] In the utility model, the first hot blast furnace combustion-supporting fan is the main fan, and the second hot blast furnace combustion-supporting fan is the standby fan. During operation, the denitrification system sends the purified high-temperature flue gas obtained by treating the sintering waste gas into the main flue gas duct through the original SCR low-leakage fan, most of the flue gas is returned to the SCR for use, and part of the high-temperature flue gas is diverted through the flue gas branch pipe to the first hot blast furnace combustion-supporting fan, and the air and the purified flue gas enter the first hot blast furnace combustion-supporting fan together, and are sent into the hot blast furnace through the fan outlet duct after being collected inside the first hot blast furnace combustion-supporting fan. The temperature detection instrument is used to detect the flue gas temperature in the fan outlet duct, so as to adjust the amount of flue gas entering the hot blast furnace through the flue gas regulating valve as needed; the oxygen content detection instrument is used to detect the oxygen content in the fan outlet duct, so as to adjust the amount of air entering the first hot blast furnace combustion-supporting fan through the air supply regulating valve as needed.

[0011] The number of air supply ducts of the hot blast stove air supply system of the utility model matches the number of the hot blast stove combustion-supporting fans; as shown in the embodiment of the present application, when there are two hot blast stove combustion-supporting fans, two flue gas branch pipes are required, and the two flue gas branch pipes can be directly connected to the main flue gas duct, or one of the flue gas branch pipes can be installed on the other flue gas branch pipe, as long as the main flue gas duct and the hot blast stove combustion-supporting fan can be connected. This is a conventional pipe installation structure and will not be described in detail here. In addition, the terms "first" and "second" are only used to distinguish between the same structural parts, and cannot be understood as indicating or implying relative importance.

[0012] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A hot blast stove air supply system, characterized in that: It is located between the hot blast furnace combustion-supporting fan and the main flue gas duct, the hot blast furnace combustion-supporting fan is connected to the fan outlet air duct, and a temperature detection instrument and an oxygen content detection instrument are installed on the fan outlet air duct at one end close to the hot blast furnace combustion-supporting fan. The hot blast furnace combustion-supporting fan is installed with an air supply duct, one end of which is connected to the air, and an air supply regulating valve is installed on the air supply duct. The hot blast furnace combustion-supporting fan is connected to the main flue gas duct through a flue gas branch pipe, and a flue gas regulating valve is installed on the flue gas branch pipe.

2. The hot blast stove air supply system according to claim 1, characterized in that: There are two hot blast furnace combustion-supporting fans, each of which is equipped with an air supply pipe, and each of which is equipped with an air supply regulating valve. Each of the hot blast furnace combustion-supporting fans is connected to the main flue gas pipe through a flue gas branch pipe, and each of the flue gas branch pipes is equipped with a flue gas regulating valve.

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